如何复制可观察集合

发布于 2024-10-02 08:48:55 字数 176 浏览 9 评论 0原文

在这种情况下，我

Observablecollection<A> aRef = new Observablecollection<A>();
bRef = aRef();

都指向相同的 ObservableCollection。如何制作不同的副本？

原文

I have

Observablecollection<A> aRef = new Observablecollection<A>();
bRef = aRef();

In this case both point to same ObservableCollection. How do I make a different copy?

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最好是你 2024-10-09 08:48:55

这样做：

// aRef being an Observablecollection 
Observablecollection<Entity> bRef = new Observablecollection<Entity>(aRef);

这将创建一个可观察的集合，但项目仍然指向原始项目。如果您需要项目指向克隆而不是原始项目，则需要实现然后调用克隆方法。

更新

如果您尝试添加到列表，然后可观察集合具有原始列表，只需通过传递原始列表来创建可观察集合：

List<Entity> originalEnityList = GetThatOriginalEnityListFromSomewhere();
Observablecollection<Entity> bRef = new Observablecollection<Entity>(originalEnityList);

Do this:

// aRef being an Observablecollection 
Observablecollection<Entity> bRef = new Observablecollection<Entity>(aRef);

This will create an observable collection but the items are still pointing to the original items. If you need the items to point a clone rather than the original items, you need to implement and then call a cloning method.

UPDATE

If you try to add to a list and then the observable collection have the original list, just create the Observablecollection by passing the original list:

List<Entity> originalEnityList = GetThatOriginalEnityListFromSomewhere();
Observablecollection<Entity> bRef = new Observablecollection<Entity>(originalEnityList);

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反差帅 2024-10-09 08:48:55

您可以在实体定义中实现 ICloneable 接口，然后使用内部强制转换创建 ObservableCollection 的副本。因此，您将拥有一个克隆的 List，而不会引用旧项目。然后，您可以使用克隆的 List 创建新的 ObservableCollection

public class YourEntity : ICloneable {
    public AnyType Property { get; set; }
    ....
    public object Clone()
    {
        return MemberwiseClone();
    }
}

实现将是

var clonedList = originalObservableCollection.Select(objEntity => (YourEntity) objEntity.Clone()).ToList();

ObservableCollection<YourEntity> clonedCollection = new ObservableCollection<YourEntity>(clonedList);

You could implement ICloneable interface in you entity definition and then make a copy of the ObservableCollection with a internal cast. As a result you will have a cloned List without any reference to old items. Then you could create your new ObservableCollection whit the cloned List

public class YourEntity : ICloneable {
    public AnyType Property { get; set; }
    ....
    public object Clone()
    {
        return MemberwiseClone();
    }
}

The implementation would be

var clonedList = originalObservableCollection.Select(objEntity => (YourEntity) objEntity.Clone()).ToList();

ObservableCollection<YourEntity> clonedCollection = new ObservableCollection<YourEntity>(clonedList);

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